The document proposes a new intrusion detection system called EAACK that is designed specifically for mobile ad hoc networks (MANETs). Existing intrusion detection systems for MANETs have weaknesses including being vulnerable to false misbehavior reports and forged acknowledgment packets. EAACK addresses these weaknesses by using digital signatures to authenticate acknowledgment packets and thereby guarantee their validity. This helps EAACK more accurately detect malicious nodes and behaviors. The system is also designed to reduce network overhead compared to previous acknowledgment-based approaches.

1. EAACK—A Secure Intrusion-Detection System for MANETs
ABSTRACT:
The migration to wireless network from wired network has been a global trend in the past few
decades. The mobility and scalability brought by wireless network made it possible in many
applications. Among all the contemporary wireless networks, Mobile Ad hoc NETwork
(MANET) is one of the most important and unique applications. On the contrary to traditional
network architecture, MANET does not require a fixed network infrastructure; every single
node works as both a transmitter and a receiver. Nodes communicate directly with each other
when they are both within the same communication range. Otherwise, they rely on their
neighbors to relay messages. The self-configuring ability of nodes inMANETmade it popular
among critical mission applications like military use or emergency recovery. However, the open
medium and wide distribution of nodes make MANET vulnerable to malicious attackers. In this
case, it is crucial to develop efficient intrusion-detection mechanisms to protect MANET from
attacks. With the improvements of the technology and cut in hardware costs, we are witnessing
a current trend of expanding MANETs into industrial applications. To adjust to such trend, we
strongly believe that it is vital to address its potential security issues. In this paper, we propose
and implement a new intrusion-detection system named Enhanced Adaptive ACKnowledgment
(EAACK) specially designed for MANETs. Compared to contemporary approaches, EAACK
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2. demonstrates higher malicious-behavior-detection rates in certain circumstances while does not
greatly affect the network performances.
EXISTING SYSTEM:
By definition, Mobile Ad hoc NETwork (MANET) is a collection of mobile nodes equipped
with both a wireless transmitter and a receiver that communicate with each other via
bidirectional wireless links either directly or indirectly. Unfortunately, the open medium and
remote distribution of MANET make it vulnerable to various types of attacks. For example, due
to the nodes’ lack of physical protection, malicious attackers can easily capture and compromise
nodes to achieve attacks. In particular, considering the fact that most routing protocols in
MANETs assume that every node in the network behaves cooperatively with other nodes and
presumably not malicious, attackers can easily compromise MANETs by inserting malicious or
noncooperative nodes into the network. Furthermore, because of MANET’s distributed
architecture and changing topology, a traditional centralized monitoring technique is no longer
feasible in MANETs. In such case, it is crucial to develop an intrusion-detection system (IDS)
specially designed for MANETs.
DISADVANTAGES OF EXISTING SYSTEM:
Watchdog scheme fails to detect malicious misbehaviors with the presence of the following: 1)
ambiguous collisions; 2) receiver collisions; 3) limited transmission power; 4) false
misbehavior report; 5) collusion; and 6) partial dropping.
The TWOACK scheme successfully solves the receiver collision and limited transmission
power problems posed by Watchdog. However, the acknowledgment process required in every
packet transmission process added a significant amount of unwanted network overhead. Due to
the limited battery power nature of MANETs, such redundant transmission process can easily
degrade the life span of the entire network.

3. The concept of adopting a hybrid scheme in AACK greatly reduces the network overhead, but
both TWOACK and AACK still suffer from the problem that they fail to detect malicious nodes
with the presence of false misbehavior report and forged acknowledgment packets.
PROPOSED SYSTEM:
In fact, many of the existing IDSs in MANETs adopt an acknowledgment-based scheme,
including TWOACK and AACK. The functions of such detection schemes all largely depend
on the acknowledgment packets. Hence, it is crucial to guarantee that the acknowledgment
packets are valid and authentic. To address this concern, we adopt a digital signature in our
proposed scheme named Enhanced AACK (EAACK).
ADVANTAGES OF PROPOSED SYSTEM:
Our proposed approach EAACK is designed to tackle three of the six weaknesses of Watchdog
scheme, namely, false misbehavior, limited transmission power, and receiver collision.
SYSTEM CONFIGURATION:-
HARDWARE CONFIGURATION:-
 Processor - Pentium –IV
 Speed - 1.1 Ghz
 RAM - 256 MB(min)
 Hard Disk - 20 GB
 Key Board - Standard Windows Keyboard
 Mouse - Two or Three Button Mouse
 Monitor - SVGA

4. SOFTWARE CONFIGURATION:-
 Operating System : Windows XP
 Programming Language : JAVA
 Java Version : JDK 1.6 & above.
REFERENCE:
Elhadi M. Shakshuki, Senior Member, IEEE, Nan Kang, and Tarek R. Sheltami, Member,
IEEE, “EAACK—A Secure Intrusion-Detection System for MANETs”, IEEE
TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 60, NO. 3, MARCH 2013.